Safety device for hanging electric-arc lamps



(No Model.)

E.. P.. sNoWDEN. SAFETY DEVICE FOR HANGING ELECTRIC ARO LAMPS.

No. 567.322. .Patented Sept. 8, 1896.

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UNITED STATES PATI-:NT OFFICE.

EDVVARD P. SNOWDEN, OF ST. JOSEPH, MISSOURI.

SAFETY DEVICE FOR HANGING ELECTRIC-ARO LAMPS.

SPEGIFIGATION forming part of Letters Patent No. 567,322, dated September 8, 1896.

Application filed January 23, 1896. Serial No. 576,488. (lio model.)

To all whom, it may concern:

Be it known that I, EDWARD P. SN OWDEN, a Citizen of the United States, residing at St. Joseph, in the County of Buchanan and State of Missouri, have nvented certain new and useful Improveinents in Safety Devices for Hanging Electric-Aro Lamps; and 1 do declare the following to be a full, Clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the let-ters of reference marked thereon, which form a part of this specification.

My invention relates to Vimprovements in safety devices for hanging electric-arc lamps in. which the current is shifted from the lamp direct through the springs when the lamp is lowered, and I attain my object in the manner illustrated by the accompanying drawings, in which- Figure I is a perspective view of the safety device with a portion of the .case cut away to more clearly show the internal mechanism, here presented with the current Cut off from the lamp; and Fig. II is a full front View of a portion of the case-partition with its attached parts, showing the relative positions of these parts when the current is passing through the lamp.

Similar letters refer to similar parts in both views.

A is a double pulley-wheel.

B and O are single pulley-wheels.

D is the case-partition to which the pulleywheels are fastened.

E and F are metal springs used as electric condnctors.

H is a conducting-point of the plug.

J J are the plug lamp-condnctors.

K K are wires connecting lamp-condnctors to lamp-terminals.

L is a table to which the plug is secured.

M M are rods which suspend the lamp from table.

N N are cables which suspend the safety hanging device.

O O are cables for lifting table L and its attached parts.

P P are the line-wires.

R is the case inclosing mechanism.

S is a non-Conducting part of the plug.

To use my invention, the case is suspended in the air between two or more poles, or otherwise, by cables N N, (the front left-hand cable being cut away in drawings.) The Cables O O having been passed over double pulleywheelA and over pulley-wheels B and O down to table L, as shown in drawings, the line-wires P P are connected to condnctors E and F, which, owing to the curved springs, are in direct contact. The current is now passing from one line-wire P through condnctors E and F into the other line-wire P. The operator, who has hold ofthe cables O O beside the pole, now pulls down on these cables O O, which draws .up the plug, table, and lamp. The point H of the plug inserts itself between the spring-conductors E and F and presses them apart. The separation of the springs would cause a flash were it not that the point H of the plug is a conductor and carries the current across. Point H is insulatedfrom the lower part of the plug by the insulating material S, as shown in the drawings. The current therefore does not begin to pass through the lamp until the point H has been drawn up past the springs and the lamp-condnctors J J come in contact with E and F, as in Fig. II. The current now passes from one line-wire P, through E and J and lamp-wire K, to the lampterininal or binding-post on lamp, and out through the other lamp-wire K, lamp-conductor J, Spring-conductor F, and line-wire P. After passing over pulley-wheels B and C Cables O O pass through openings in the bottom of the case. This insures the plug coming into its proper position every time it is raised.

To take the lamp out of Circuit, the Cables O O are slackened by the operator and the weight of table L, and the suspended lamp draws the plug out from between springs E and F. The point H again serves to carry the current for an instant from E to F until the springs come in contact with each other.

VVhat I claim, and desire to secure by Letters Patent, is-

1. In a safety device for hanging electricarc lamps the combination of springs E and F together with condnctors J J for closing the Circuit through the lamp and breaking the Circuit in hanger by conductor H' first pass- IOO ing between and above springs E and F, to- ;ether With table L, and eables O O, snbstantially as shown and as set forth.

2. In a safety device for hanging` electricarc lalnps a plug` eonsisting,` of eonduetingpoint H, a non-eondneting,` part S and the two eondncting` parts J J, in combination With spring-eondnetors E and F, snbstantially as described and for the pnrpose specified.

3. In a deviee for hanging eleotrie are 1amps, in a combination, case R, ease-partition D, double pulley-Wheel A and single pulley-wheels B and O, each fastened to casepartition D, and Cables O O earried upon said pulley-Wheels; table L, which is loWered and 

